Quelle: A. Schweiger, G. Jeschke, Principles of Pulse Electron Paramagnetic Resonance, 1st ed.,. Oxford University Press, Oxford, Principles of pulse electron paramagnetic resonance The table of contents ( PDF, 35 KB) is available in PDF format. There is a list of errata (PDF, 90 KB). Principles of pulse electron paramagnetic resonance. By A Schweiger and G Jeschke, Oxford University Press, UK, , pp. ISBN 0
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Pulse EPR (electron paramagnetic resonance) is one of the newest and most widely used techniques for examining the structure, function and. Electron paramagnetic resonance (EPR) = Electron spin resonance (ESR) Same underlying physical principles as in nuclear magnetic resonance (NMR) .. “Pulsed Electron Spin Resonance Spectroscopy: Basic principles. Keywords: Electron paramagnetic resonance · ENDOR · EPR methodology · Transition metal complexes. Electron Illustration of the potential of pulse EPR for structural analysis. The full .  A. Schweiger, G. Jeschke, 'Principles of pulse.
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Volume 79 , Issue 1 January Pages Related Information. Email or Customer ID. As the net magnetization vector precesses, some spin packets slow down due to lower fields and others speed up due to higher fields leading to a fanning out of the magnetization vector that results in the decay of the EPR signal.
The other packets contribute to the transverse magnetization decay due to the homogeneous broadening. In this process all the spin in one spin packet experience the same magnetic field and interact with each other that can lead to mutual and random spin flip-flops.
These fluctuations contribute to a faster fanning out of the magnetization vector. All the information about the frequency spectrum is encoded in the motion of the transverse magnetization. The frequency spectrum is reconstructed using the time behavior of the transverse magnetization made up of y- and x-axis components.
It is convenient that these two can be treated as the real and imaginary components of a complex quantity and use the Fourier theory to transform the measured time domain signal into the frequency domain representation. This is possible because both the absorption real and the dispersion imaginary signals are detected.
The FID signal decays away and for very broad EPR spectra this decay is rather fast due to the inhomogeneous broadening. To obtain more information one can recover the disappeared signal with another microwave pulse to produce a Hahn echo.
Different frequencies in the EPR spectrum inhomogeneous broadening cause this signal to "fan out", meaning that the slower spin-packets trail behind the faster ones. A complete refocusing of the signal occurs then at time 2t.
An accurate echo caused by a second microwave pulse can remove all inhomogeneous broadening effects. After all of the spin-packets bunch up, they will dephase again just like an FID.